Chapter 14 20. No matter where you travel in space, you would observe very simil
ID: 233769 • Letter: C
Question
Chapter 14
20. No matter where you travel in space, you would observe very similar distributions of galaxies. This is an example of
a. isotropy.
b. homogeneity.
c. hydrostatic equilibrium.
d. energy balance.
22. Emission lines from a spinning accretion disk around a black hole in an active galactic nucleus would be
a. always redshifted.
b. always blueshifted.
c. both redshifted and blueshifted.
d. it depends on the viewing angle
Chapter 15
18. Why are globular clusters uniquely useful in determining the size of the galaxy?
a. They are large.
b. They are bright.
c. They are evenly distributed around the center.
d. They consist mostly of old stars and have been there a long time.
19. In order for a variable star to be useful as a standard candle, its luminosity must be related to its
a. period of variation.
b. mass.
c. temperature.
d. radius.
21. Cosmic rays are
a. a form of electromagnetic radiation.
b. high-energy particles.
c. high-energy dark matter.
d. high-energy photons.
22. In the Hubble scheme for classifying galaxies, what type of galaxy is the Milky Way?
a. elliptical
b. spiral
c. barred spiral
d. irregular
23. Where are the youngest stars in the Milky Way?
a. in the core
b. in the bulge
c. in the disk
d. in the halo
24. Halo stars are found in the vicinity of the Sun. What observational evidence distinguishes them from disk stars?
a. the direction of their motion
b. their speed
c. their mass
d. their temperature
25. Why are most of the Milky Way’s satellite galaxies so difficult to detect?
a. They are very faint.
b. They are too far away.
c. The halo of the Milky Way obscures the view.
d. They are very massive, and light does not escape them.
Explanation / Answer
Chapter 14
20. (b) homogeneity
22. (d) depends on the viewing angle
Chapter 15
18. (d) They consist mostly of old stars and have been there a long time.
19. (a) Period of variation
21. (b) high energy particles
22. (c) Barred Spiral
23. (c) in the disk
24. (a) The direction of their motion
25. (a) There are very faint.
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